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Identifying Sites Suitable for Marine Habitat Restoration Or Creation (MMO1135)

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Identifying Sites Suitable for Marine Habitat Restoration Or Creation (MMO1135) Identifying sites suitable for marine habitat restoration or creation (MMO1135) MMO1135: Identifying sites suitable for marine habitat restoration or creation February 2019 Report prepared by: ABPmer, with assistance from AER and the RSPB (the latter for the datalayer elements only). Version Author Note 0.1 ABPmer and First draft AER 1.0 C Graham & MMO Comments A Smith - MMO 1.1 ABPmer Final © Marine Management Organisation 2019 You may use and re-use the information featured on this report (not including logos) free of charge in any format or medium, under the terms of the Open Government Licence. Visit www.nationalarchives.gov.uk/doc/open-government-licence/ to view the licence or write to: Information Policy Team The National Archives Kew London TW9 4DU Email: [email protected] Information about this publication and further copies are available from: Marine Management Organisation Lancaster House Hampshire Court Newcastle upon Tyne NE4 7YH Tel: 0300 123 1032 Email: [email protected] Website: www.gov.uk/mmo Disclaimer This report contributes to the Marine Management Organisation (MMO) evidence base which is a resource developed through a large range of research activity and methods carried out by both MMO and external experts. The opinions expressed in this report do not necessarily reflect the views of MMO nor are they intended to indicate how MMO will act on a given set of facts or signify any preference for one research activity or method over another. MMO is not liable for the accuracy or completeness of the information contained nor is it responsible for any use of the content. Report Citation MMO (2019) Identifying sites suitable for marine habitat restoration or creation. A report produced for the Marine Management Organisation by ABPmer and AER, MMO Project No: 1135, February 2019, 93pp Contents Executive summary .................................................................................................. 1 1. Introduction .......................................................................................................... 2 2. Methods ................................................................................................................ 3 2.1. The datalayers ................................................................................................. 3 2.2. A list of ‘best’ habitats ...................................................................................... 4 3. Habitat background .............................................................................................. 5 3.1. Intertidal mudflats and saltmarshes ................................................................. 5 3.1.1 Intertidal mudflat and saltmarsh ecology ................................................ 5 3.1.2 Intertidal mudflat and saltmarsh creation and restoration techniques ..... 8 3.2. Seagrass meadows ....................................................................................... 14 3.2.1 Seagrass ecology ................................................................................. 14 3.2.2 Seagrass creation and restoration techniques ...................................... 16 3.3. Biogenic reefs ................................................................................................ 18 3.3.1 Biogenic reef ecology (focussing on the European flat oyster Ostrea edulis and the honeycomb worm Sabellaria alveolata) ..................................... 18 3.3.2 Biogenic reef creation and restoration techniques ................................ 22 3.4. Ecological enhancements .............................................................................. 25 4. The datalayers .................................................................................................... 27 4.1. Mudflat and saltmarsh datalayers .................................................................. 28 4.1.1 Managed realignment and Regulated Tidal Exchange – datalayer showing ‘Potential habitat creation sites within the current floodplain’ .............. 28 4.1.2 Beneficial use datalayers ...................................................................... 32 4.2. Seagrass datalayer – ‘Potential seagrass creation / restoration - historic sites’ .............................................................................................................................. 37 4.3. Biogenic reef datalayers ................................................................................ 39 5. ‘Best’ habitats for restoration / creation .......................................................... 41 5.1. Policy context................................................................................................. 41 5.2. Principles and guidance ................................................................................. 44 5.3. The marine environment ................................................................................ 48 5.4. ‘Best’ habitats for restoration / creation .......................................................... 50 5.5. Summary of workshop discussions ................................................................ 52 6. Conclusions and recommendations ................................................................. 53 7. References .......................................................................................................... 55 8. Abbreviations and acronyms ............................................................................ 68 Annex A. LiDAR validation sites for the datalayer ‘Potential habitat creation sites within the current floodplain’ ....................................................................... 70 Annex B. Potential future seagrass restoration sites ......................................... 80 B.1. Cornwall ........................................................................................................ 80 B.2 Devon .......................................................................................................... 81 B.3 Dorset ......................................................................................................... 83 B.4 Hampshire and the Isle of Wight ................................................................. 84 B.5 Kent and Sussex ......................................................................................... 85 B.6 Essex .......................................................................................................... 85 B.7 Lincolnshire ................................................................................................. 86 B.8 Yorkshire, County Durham and Tyne & Wear ............................................. 86 B.9 Lancashire................................................................................................... 87 Figures Figure 1: Example data layers (“© Marine Management Organisation 2019 and Collins Bartholomew 2018 copyright.”) ........................................................ 3 Figure 2: Generalised division of intertidal habitats based on elevation in relation to tidal height (from Davis et al., 2018). ........................................................... 7 Figure 3: Aerial image of Medmerry managed realignment (January 2014). .............. 9 Figure 4: Self-regulating tide gate at the Goosemoor RTE (River Clyst, Devon). ..... 10 Figure 5: Large-scale (550,000m³) beneficial use of dredged silt for pre-breach land-forming at Allfleet’s Marsh on Wallasea Island. ................................. 11 Figure 6: Image of Horsey Island (north shore), showing recharge area, wave breaks, and sedimentation fields. .............................................................. 12 Figure 7: Schematic representation of the influence of increasing nutrient levels on seagrass (from Burkholder et al., 2007). ................................................... 15 Figure 8: Influence of restoration scale and method on seagrass survival and growth (from Katwijk et al., 2016). ......................................................................... 17 Figure 9: The largest Sabellaria alveolata reef in Europe in the Bay Mont St. Michelle. .................................................................................................... 18 Figure 10: Ostrea edulis cemented to intertidal boulder. .......................................... 20 Figure 11: Ostrea edulis beds during the 19th Century (from Olsen, 1883). ............ 21 Figure 12: Sabellaria alveolata colonising artificial material in intertidal area. .......... 22 Figure 13: Divers placing oysters on shell clutch in the Dornoch Firth (from BBC, 2018). ........................................................................................................ 25 Figure 14: Key factors improving the likelihood of seagrass restoration success (From AER). .............................................................................................. 38 Figure 15: Example species offset calculation (and image of hypothetical windfarm) (from Dickie., 2013). .................................................................................. 47 Figure 16: Example habitat equivalency calculation (from NOAA, 1995/2000). ....... 48 Figure A.21: Location of LiDAR validation sites. ...................................................... 72 Figure A.22: Potential intertidal habitats at Glasson. ................................................ 73 Figure A.23: Potential intertidal habitats at Brean. ................................................... 74 Figure A.24: Potential intertidal habitats
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